33 10 Rear Axle Differential E60, E61, E63, E64, E81, E86, E87, E90, E91, E92, E93, E70 / 188L

WARNING: This page is about a different car, the 2007 BMW 550i and 2006 BMW 550i. However, it is still accessible from the selected car via links, so may be relevant.